Rotatable hairbrush



FIG. 1 is a front elevational view of a rotatable hairbrush showing our new design;

FIG. 2 is a side elevational view of the rotatable hairbrush as seen from the left side of the hairbrush;

FIG. 3 is a rear elevational view of the hairbrush;

FIG. 4 is a top plan view of the hairbrush; and,

FIG. 5 is a bottom plan view of the hairbrush. 

The ornamental design for a rotatable hairbrush, as shown and described. 